Bit-depth extension in a digital display using quantization of noise-compensated image data

(19)

(11)

EP 1 583 358 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	02.07.2008 Bulletin 2008/27

(43)	Date of publication A2:
	05.10.2005 Bulletin 2005/40

(21)	Application number: 05013490.7

(22)	Date of filing: 17.10.2000

(51)

International Patent Classification (IPC):

H04N 5/66^(2006.01)
H04N 5/21^(2006.01)

G09G 5/02^(2006.01)
G09G 3/20^(2006.01)

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

22.10.1999 US 426165

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	03002754.4 / 1322113
	00122640.6 / 1094420

(71)	Applicant: Sharp Kabushiki Kaisha
	Osaka (JP)

(72)	Inventor:
	Daly, Scott Kalama, WA 98625 (US)

(74)	Representative: Müller - Hoffmann & Partner
	Patentanwälte, Innere Wiener Strasse 17 81667 München 81667 München (DE)

(54)	Bit-depth extension in a digital display using quantization of noise-compensated image data

(57) A method for extending bit-depth of display systems. The method includes the steps of measuring the static display noise of a display device (14), using the display noise to create pseudo-random noise (12) and subtracting the pseudo-random noise (12) from a contone image (10). After the noise-compensated image data is quantized and displayed, the noise in the display device (14) will substantially convert the noise-compensated image data back to contone image data with few or no contouring artifacts. Other embodiments include using the inherent noise of the human visual system (22) instead of the static display noise, or both. Specific adjustments can be made to the noise of the human visual system (22) for color displays.

Search report